int32 ParticipantType  
# ParticipantType_unknown	= 0,
# ParticipantType_motor	= 1,
# ParticipantType_non_motor	= 2,
# ParticipantType_pedestrian	= 3,
# ParticipantType_rsu	= 4
int32 ptcId #temporary ID set by RSU
int32 SourceType
# SourceType_unknown	= 0,
# SourceType_selfinfo	= 1,
# SourceType_v2x	= 2,
# SourceType_video	= 3,
# SourceType_microwaveRadar	= 4,
# SourceType_loop	= 5,
# SourceType_lidar	= 6,
# SourceType_integrated	= 7
int32 lon
int32 lat
#CREATE_PositionOffsetLLV,present,lon and lat offset 
float32 speed
float32 heading 
float32 length
float32 width
float32 height

